A rapid and accurate two-point ray tracing method in horizontally layered velocity model

• 作 者: 田玥 陈晓非
• 机 构: Department of Geophysics, Peking University, Beijing 100871, China,Department of Geophysics, Peking
• 出 处: Acta Seismologica Sinica(English Edition)
• 发表日期: 2005年02期
• 关键词: tracing layered Figure iteration guess searching iterative superiority intersect

A rapid and accurate method for two-point ray tracing in horizontally layered velocity model is presented in this paper. Numerical experiments show that this method provides stable and rapid convergence with high accuracies, regardless of various 1-D velocity structures, takeoff angles and epicentral distances. This two-point ray tracing method is compared with the pseudobending technique and the method advanced by Kim and Baag (2002). It turns out that the method in this paper is much more efficient and accurate than the pseudobending technique, but is only applicable to 1-D velocity model. Kim′s method is equivalent to ours for cases without large takeoff angles, but it fails to work when the takeoff angle is close to 90o. On the other hand, the method presented in this paper is appli- cable to cases with any takeoff angles with rapid and accurate convergence. Therefore, this method is a good choice for two-point ray tracing problems in horizontally layered velocity model and is efficient enough to be ap- plied to a wide range of seismic problems.

A rapid and accurate method for two-point ray tracing inpite layered model is presented in this paper. Numerical experiments show that this method provides stable and rapid convergence with high accuracies, regardless of various 1-D velocity structures, takeoff angles and epicentral This two-point ray tracing method is compared with the pseudobending technique and the method advanced by Kim and Baag (2002). It turns out that the method in this paper is much more efficient and accurate than the pseudobending technique, but is only applicable to 1-D velocity model. Kim’s method is equivalent to ours for cases without large takeoff angles, but it fails to work when the takeoff angle is close to 90o. On the other hand, the method presented in this paper is appli - cable to cases with any takeoff angles with rapid and accurate convergence. Thus, this method is a good choice for two-point ray tracing problems inolably layered velocity model and is ef ficient enough to be ap- plied to a wide range of seismic problems.